Improvement in sewing-machines



- 4Sheets--Sheet'I 1. A. HousE. l Sewing-Machines. N0. 145,570. Patented Dec.,16,18*73..

M kA-Wf kw 4 Sheets--Sheet 2. J. A. HOUSE.

Sewing-Machines.

Patented Del:A 16,1873.

4 Sheets--Sheet 3.

l. A. HOUSE. Sewing-Machines.

Patented Dec. 16,1873.

v 4Sheets- Sheet4. l. A. HOUSE, Sewing-Machines. No. 145,570.

Patented Dec. 16,1873.

.UNITED STATES PATENT CFFICE.

JAMES 'A. HOUSE, OF BRIDGEPORT, CONN., ASSIGNOR TO THEKWHEELER AND WILSON MANUFACTURING COMPANY, OF SAME PLACE.

IMPROVEMENT IN SEWING-MACHINES.

Specification forming part of Letters Patent No. 145,570, dated December 16, 1873; application tiled November 3, 1873.

, constitutes an improvement on the machine patented to me March 5, 1872, as No. 124,360.

The subject-matter claimed is hereinafter specified.

In the accompanying drawings, which rep- 'resent my improvements as embodied4 in the best way now known to me, Figure 1 represents a view, in elevation, of one side of the machine, with portions broken away to show other parts more clearly Fig. 2, aY front view; Fig. 3, a view, in elevation, of portions of the needle end of the machine; Fig. 4, a plan or top view of the front end of the lower portion of the machine with the table removed 5 Fig. 5, a view, in perspective, of the thread-controlling device; Fig. 6, a similar view of the tension-finger, enlarged 5 Fig. 7, a transverse section of the main shaft on the line x m of Fig. 1, and Fig. S a similar section on the line y y of Fig. 1.

The mechanism is mounted upon, and some parts of it inclosed by, a hollow frame or casing, A, upon which a bracket-arm, B, is mounted. A shaft, C, driven by power applied in any suitable well-known way, carries a cam, D, which vibrates a needle-arm, D', having its fulcrum on the bracket-arm, and linked to a needle-bar, E, reciprocating end- Wise in guides in the bracket-arm. The shaft C carries another cam, F, which vibrates a take-up arm, F', likewise pivoted on the bracket-arm. The front end of this lever is provided with an eye or loop, f, through which the upper thread passes, as well as with a roller, f', over which said thread runs.. This shaft C also imparts a differential movement to a shaft, C', carrying a revolving` hook, l, in

which a bobbin, I', is secured. The machine is also provided with the usual four-motion feed J, and with a presser-foot, G.

The construction and operation of the devices hereinbefore mentioned are substantially the same as those described in my Letters Patent hereinbefore referred to, except as hereinafter stated.

A presser-bar, G, movable freely endwise in its bearings in the bracket-arm, is pressed down to its work by an adjustable spring, M, and lifted, when required, by a cam-lever, M', acting on said spring. A presser foot or roller, g, is mounted 011 an arm, G, hinged or pivoted, at g1, to the'presser-bar G, so as'to allow the presser-foot easily to be swung out of the way. A ring or collar, g2, movable on the bar, serves to hold the presser-foot down to its work, when desired. Upon this presser-bar G is also mounted an adjustable collar, h, to which an arm, H, is hinged. This arm carries atensionspring provided with an eye, h', through which the upper thread passes. As the needle-bar rises, a collar, e, on it strikes this hinged arm H, and forces it to one side, thus rapidly drawingup the upper thread from the hook, while in the descent of the needle-bar the arm is left free to swing inward after the needle enters the fabric, and thus rapidly slacken the thread. When thick ma- 'terial is being sewed, the presser-foot necessarily rises to accommodate it; consequently the needle-bar in its descent releases the swinging arm H, and thus leaves the thread free to run out at an earlier stage, thus compensating the rise of the presser foot or wheel, it being my intention that the thread-controller shall be released just as the eye of the needle descends into the cloth. The bobbin is held up toits work by an adjustable slide-rest, K, having one or more slotted arms, through which holding-springs k pass. The hook is provided with a pad, t', preferably of metal, between which and a spring tension-finger, L, the bobbin-thread is clamped at each revolution as soon as the loop of needle-thread has passed around the bobbin and upward through the nger, to tighten the stitch. The spring tension-iinger L is mounted on the frame under the cloth-plate, and its pressure upon the hookpad regulated by a lever, L', also pivoted on the frame, thus adapting the tension to thread of Varying,` inene-ss. The needle Works through a hole in this finger.

I claim as my inventionl. The combination, substantially as set forth, of a presser-bar, a presser-foot pivoted therein, and a lockingfring on the presser-bar, whereby the presser-foot, When at Work, is looked by the ring, and yet can be turned up out of the Way when desired.

2. The combination, substantially as set forth, of a spring tension-nger and a rotating pad on the hook, to look the bobbin-thread While the stitch is being tightened.

3. The combination, substantially as set forth, of the rotating pad, the tension-finger, and the adjustable spring-lever for varying the tension of the lower thread.

In testimony whereof I have hereunto subscribed my name.

Witnesses: JAMES A. HOUSE.

GEORGE H. DIAMOND, A. It. LACEY, 

